<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
* {
    margin: 0;
    padding: 0;
}
.container {
    width: 1200px;
    margin: 0 auto;
}
.box {
    box-sizing: border-box;/* 盒模型设置为怪异（IE）盒模型 */
    margin: 0 10px;
    border: 1px solid #000;
    padding: 5px;
    display: inline-block; /* 天坑 有间隙*/
        width: 580px;
        height: 100px;
        background-color: green;
    }
    .box:nth-child(2) {
      background-color: yellow;
    }
    </style>
</head>
<body>
    <div class="container">
        <div class="box">1</div><div class="box">2</div>
    </div>
</body>
</html>